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Reach for ",[579,605,606],{},"definePlugin"," when several hooks share state.",[609,610,613,616,687],"prompt",{":actions":611,"description":612,"icon":452},"[\"copy\",\"cursor\",\"claude\"]","Build a multi-hook evlog plugin",[576,614,615],{},"Build an evlog plugin that hooks into more than one lifecycle stage.",[617,618,619,653,659,662,676],"ul",{},[620,621,622,623,625,626,629,630,633,634,633,637,633,640,633,643,633,646,633,649,652],"li",{},"Import ",[579,624,606],{}," from ",[579,627,628],{},"evlog"," and pick the hooks I need (",[579,631,632],{},"onRequestStart",", ",[579,635,636],{},"enrich",[579,638,639],{},"drain",[579,641,642],{},"extendLogger",[579,644,645],{},"keep",[579,647,648],{},"onClientLog",[579,650,651],{},"onRequestFinish",")",[620,654,655,656,658],{},"Keep ",[579,657,636],{}," pure (no I\u002FO, no throwing, use try\u002Fcatch internally)",[620,660,661],{},"For drains, batch and ship to the destination; respect backpressure if the drain is slow",[620,663,664,665,668,669,672,673,652],{},"Register the plugin via the framework config: Next\u002Fstandalone ",[579,666,667],{},"initLogger({ plugins: [myPlugin] })",", Hono\u002FExpress\u002FFastify\u002FElysia middleware option ",[579,670,671],{},"{ plugins: [myPlugin] }",". For Nitro, register the individual hooks directly (",[579,674,675],{},"nitroApp.hooks.hook('evlog:enrich' | 'evlog:drain' | …)",[620,677,678,679,597,681,683,684,686],{},"Prefer single-purpose ",[579,680,596],{},[579,682,602],{}," wrappers for simple extensions; use ",[579,685,606],{}," only when several hooks are needed",[576,688,689,690],{},"Docs: ",[592,691,692],{"href":692,"rel":693},"https:\u002F\u002Fwww.evlog.dev\u002Fextend\u002Fplugins",[694],"nofollow",[696,697,699],"h2",{"id":698},"minimal-example","Minimal example",[701,702,707],"pre",{"className":703,"code":704,"language":705,"meta":706,"style":706},"language-ts shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { definePlugin } from 'evlog'\n\nexport const tenantPlugin = definePlugin({\n  name: 'tenant',\n  onRequestStart({ logger, headers }) {\n    const tenantId = headers?.['x-tenant-id']\n    if (tenantId) logger.set({ tenant: { id: tenantId } })\n  },\n  enrich({ event }) {\n    event.region = process.env.REGION\n  },\n})\n","ts","",[579,708,709,741,748,773,794,819,849,899,905,920,946,951],{"__ignoreMap":706},[710,711,714,718,722,726,729,732,735,738],"span",{"class":712,"line":713},"line",1,[710,715,717],{"class":716},"s7zQu","import",[710,719,721],{"class":720},"sMK4o"," {",[710,723,725],{"class":724},"sTEyZ"," definePlugin",[710,727,728],{"class":720}," }",[710,730,731],{"class":716}," from",[710,733,734],{"class":720}," '",[710,736,628],{"class":737},"sfazB",[710,739,740],{"class":720},"'\n",[710,742,744],{"class":712,"line":743},2,[710,745,747],{"emptyLinePlaceholder":746},true,"\n",[710,749,751,754,758,761,764,767,770],{"class":712,"line":750},3,[710,752,753],{"class":716},"export",[710,755,757],{"class":756},"spNyl"," const",[710,759,760],{"class":724}," tenantPlugin ",[710,762,763],{"class":720},"=",[710,765,725],{"class":766},"s2Zo4",[710,768,769],{"class":724},"(",[710,771,772],{"class":720},"{\n",[710,774,776,780,783,785,788,791],{"class":712,"line":775},4,[710,777,779],{"class":778},"swJcz","  name",[710,781,782],{"class":720},":",[710,784,734],{"class":720},[710,786,787],{"class":737},"tenant",[710,789,790],{"class":720},"'",[710,792,793],{"class":720},",\n",[710,795,797,800,803,807,810,813,816],{"class":712,"line":796},5,[710,798,799],{"class":778},"  onRequestStart",[710,801,802],{"class":720},"({",[710,804,806],{"class":805},"sHdIc"," logger",[710,808,809],{"class":720},",",[710,811,812],{"class":805}," headers",[710,814,815],{"class":720}," })",[710,817,818],{"class":720}," {\n",[710,820,822,825,828,831,833,836,839,841,844,846],{"class":712,"line":821},6,[710,823,824],{"class":756},"    const",[710,826,827],{"class":724}," tenantId",[710,829,830],{"class":720}," =",[710,832,812],{"class":724},[710,834,835],{"class":720},"?.",[710,837,838],{"class":778},"[",[710,840,790],{"class":720},[710,842,843],{"class":737},"x-tenant-id",[710,845,790],{"class":720},[710,847,848],{"class":778},"]\n",[710,850,852,855,858,861,864,867,870,873,875,878,881,883,885,888,890,892,894,896],{"class":712,"line":851},7,[710,853,854],{"class":716},"    if",[710,856,857],{"class":778}," (",[710,859,860],{"class":724},"tenantId",[710,862,863],{"class":778},") ",[710,865,866],{"class":724},"logger",[710,868,869],{"class":720},".",[710,871,872],{"class":766},"set",[710,874,769],{"class":778},[710,876,877],{"class":720},"{",[710,879,880],{"class":778}," tenant",[710,882,782],{"class":720},[710,884,721],{"class":720},[710,886,887],{"class":778}," id",[710,889,782],{"class":720},[710,891,827],{"class":724},[710,893,728],{"class":720},[710,895,728],{"class":720},[710,897,898],{"class":778},")\n",[710,900,902],{"class":712,"line":901},8,[710,903,904],{"class":720},"  },\n",[710,906,908,911,913,916,918],{"class":712,"line":907},9,[710,909,910],{"class":778},"  enrich",[710,912,802],{"class":720},[710,914,915],{"class":805}," event",[710,917,815],{"class":720},[710,919,818],{"class":720},[710,921,923,926,928,931,933,936,938,941,943],{"class":712,"line":922},10,[710,924,925],{"class":724},"    event",[710,927,869],{"class":720},[710,929,930],{"class":724},"region",[710,932,830],{"class":720},[710,934,935],{"class":724}," process",[710,937,869],{"class":720},[710,939,940],{"class":724},"env",[710,942,869],{"class":720},[710,944,945],{"class":724},"REGION\n",[710,947,949],{"class":712,"line":948},11,[710,950,904],{"class":720},[710,952,954,957],{"class":712,"line":953},12,[710,955,956],{"class":720},"}",[710,958,898],{"class":724},[576,960,961],{},"Register the plugin where you bootstrap evlog. The shape depends on your runtime:",[963,964,965,1035,1113],"code-group",{},[701,966,969],{"className":703,"code":967,"filename":968,"language":705,"meta":706,"style":706},"import { initLogger } from 'evlog'\nimport { tenantPlugin } from '.\u002Fplugins\u002Ftenant'\n\ninitLogger({ plugins: [tenantPlugin] })\n","Next.js \u002F standalone",[579,970,971,990,1010,1014],{"__ignoreMap":706},[710,972,973,975,977,980,982,984,986,988],{"class":712,"line":713},[710,974,717],{"class":716},[710,976,721],{"class":720},[710,978,979],{"class":724}," initLogger",[710,981,728],{"class":720},[710,983,731],{"class":716},[710,985,734],{"class":720},[710,987,628],{"class":737},[710,989,740],{"class":720},[710,991,992,994,996,999,1001,1003,1005,1008],{"class":712,"line":743},[710,993,717],{"class":716},[710,995,721],{"class":720},[710,997,998],{"class":724}," tenantPlugin",[710,1000,728],{"class":720},[710,1002,731],{"class":716},[710,1004,734],{"class":720},[710,1006,1007],{"class":737},".\u002Fplugins\u002Ftenant",[710,1009,740],{"class":720},[710,1011,1012],{"class":712,"line":750},[710,1013,747],{"emptyLinePlaceholder":746},[710,1015,1016,1019,1021,1023,1026,1028,1031,1033],{"class":712,"line":775},[710,1017,1018],{"class":766},"initLogger",[710,1020,769],{"class":724},[710,1022,877],{"class":720},[710,1024,1025],{"class":778}," plugins",[710,1027,782],{"class":720},[710,1029,1030],{"class":724}," [tenantPlugin] ",[710,1032,956],{"class":720},[710,1034,898],{"class":724},[701,1036,1039],{"className":703,"code":1037,"filename":1038,"language":705,"meta":706,"style":706},"import { evlogMiddleware } from 'evlog\u002F\u003Cframework>'\nimport { tenantPlugin } from '.\u002Fplugins\u002Ftenant'\n\napp.use(evlogMiddleware({ plugins: [tenantPlugin] }))\n","Hono \u002F Express \u002F Fastify \u002F Elysia",[579,1040,1041,1061,1079,1083],{"__ignoreMap":706},[710,1042,1043,1045,1047,1050,1052,1054,1056,1059],{"class":712,"line":713},[710,1044,717],{"class":716},[710,1046,721],{"class":720},[710,1048,1049],{"class":724}," evlogMiddleware",[710,1051,728],{"class":720},[710,1053,731],{"class":716},[710,1055,734],{"class":720},[710,1057,1058],{"class":737},"evlog\u002F\u003Cframework>",[710,1060,740],{"class":720},[710,1062,1063,1065,1067,1069,1071,1073,1075,1077],{"class":712,"line":743},[710,1064,717],{"class":716},[710,1066,721],{"class":720},[710,1068,998],{"class":724},[710,1070,728],{"class":720},[710,1072,731],{"class":716},[710,1074,734],{"class":720},[710,1076,1007],{"class":737},[710,1078,740],{"class":720},[710,1080,1081],{"class":712,"line":750},[710,1082,747],{"emptyLinePlaceholder":746},[710,1084,1085,1088,1090,1093,1095,1098,1100,1102,1104,1106,1108,1110],{"class":712,"line":775},[710,1086,1087],{"class":724},"app",[710,1089,869],{"class":720},[710,1091,1092],{"class":766},"use",[710,1094,769],{"class":724},[710,1096,1097],{"class":766},"evlogMiddleware",[710,1099,769],{"class":724},[710,1101,877],{"class":720},[710,1103,1025],{"class":778},[710,1105,782],{"class":720},[710,1107,1030],{"class":724},[710,1109,956],{"class":720},[710,1111,1112],{"class":724},"))\n",[701,1114,1116],{"className":703,"code":1115,"filename":250,"language":705,"meta":706,"style":706},"\u002F\u002F Register the hooks you actually use directly:\nnitroApp.hooks.hook('evlog:enrich', tenantPlugin.enrich!)\nnitroApp.hooks.hook('evlog:request:start', tenantPlugin.onRequestStart!)\n",[579,1117,1118,1124,1161],{"__ignoreMap":706},[710,1119,1120],{"class":712,"line":713},[710,1121,1123],{"class":1122},"sHwdD","\u002F\u002F Register the hooks you actually use directly:\n",[710,1125,1126,1129,1131,1134,1136,1139,1141,1143,1146,1148,1150,1152,1154,1156,1159],{"class":712,"line":743},[710,1127,1128],{"class":724},"nitroApp",[710,1130,869],{"class":720},[710,1132,1133],{"class":724},"hooks",[710,1135,869],{"class":720},[710,1137,1138],{"class":766},"hook",[710,1140,769],{"class":724},[710,1142,790],{"class":720},[710,1144,1145],{"class":737},"evlog:enrich",[710,1147,790],{"class":720},[710,1149,809],{"class":720},[710,1151,998],{"class":724},[710,1153,869],{"class":720},[710,1155,636],{"class":724},[710,1157,1158],{"class":720},"!",[710,1160,898],{"class":724},[710,1162,1163,1165,1167,1169,1171,1173,1175,1177,1180,1182,1184,1186,1188,1190,1192],{"class":712,"line":750},[710,1164,1128],{"class":724},[710,1166,869],{"class":720},[710,1168,1133],{"class":724},[710,1170,869],{"class":720},[710,1172,1138],{"class":766},[710,1174,769],{"class":724},[710,1176,790],{"class":720},[710,1178,1179],{"class":737},"evlog:request:start",[710,1181,790],{"class":720},[710,1183,809],{"class":720},[710,1185,998],{"class":724},[710,1187,869],{"class":720},[710,1189,632],{"class":724},[710,1191,1158],{"class":720},[710,1193,898],{"class":724},[696,1195,1196],{"id":1133},"Hooks",[1198,1199,1200,1216],"table",{},[1201,1202,1203],"thead",{},[1204,1205,1206,1210,1213],"tr",{},[1207,1208,1209],"th",{},"Hook",[1207,1211,1212],{},"When",[1207,1214,1215],{},"Use it for",[1217,1218,1219,1236,1251,1264,1284,1297,1310,1323],"tbody",{},[1204,1220,1221,1227,1230],{},[1222,1223,1224],"td",{},[579,1225,1226],{},"setup(ctx)",[1222,1228,1229],{},"Once when registered",[1222,1231,1232,1233,1235],{},"Read ",[579,1234,940],{},", set up shared state",[1204,1237,1238,1243,1246],{},[1222,1239,1240],{},[579,1241,1242],{},"onRequestStart(ctx)",[1222,1244,1245],{},"Each request, before any handler runs",[1222,1247,1248,1249],{},"Pull values from headers into ",[579,1250,866],{},[1204,1252,1253,1258,1261],{},[1222,1254,1255],{},[579,1256,1257],{},"enrich(ctx)",[1222,1259,1260],{},"Every event, before drain",[1222,1262,1263],{},"Add derived fields (geo, deploy id…)",[1204,1265,1266,1271,1274],{},[1222,1267,1268],{},[579,1269,1270],{},"keep(ctx)",[1222,1272,1273],{},"Tail sampling decision",[1222,1275,1276,1277,633,1280,1283],{},"Force-keep based on outcome (",[579,1278,1279],{},"status >= 400",[579,1281,1282],{},"duration > 500",", …)",[1204,1285,1286,1291,1294],{},[1222,1287,1288],{},[579,1289,1290],{},"drain(ctx)",[1222,1292,1293],{},"Every emitted event",[1222,1295,1296],{},"Side-effect: alert, mirror to a queue, etc.",[1204,1298,1299,1304,1307],{},[1222,1300,1301],{},[579,1302,1303],{},"onRequestFinish(ctx)",[1222,1305,1306],{},"After response",[1222,1308,1309],{},"Per-request post-processing",[1204,1311,1312,1317,1320],{},[1222,1313,1314],{},[579,1315,1316],{},"onClientLog(ctx)",[1222,1318,1319],{},"Browser-submitted event hits the ingest endpoint",[1222,1321,1322],{},"Observe \u002F reject client traffic",[1204,1324,1325,1330,1333],{},[1222,1326,1327],{},[579,1328,1329],{},"extendLogger(logger)",[1222,1331,1332],{},"Each request",[1222,1334,1335,1336,652],{},"Add custom methods (e.g. ",[579,1337,1338],{},"logger.audit.refund()",[576,1340,1341,1342,1345,1346,869],{},"Every hook is ",[584,1343,1344],{},"optional",". A plugin can implement any subset. The full type lives in ",[592,1347,1350],{"href":1348,"rel":1349},"https:\u002F\u002Fgithub.com\u002Fevloghq\u002Fevlog\u002Fblob\u002Fmain\u002Fpackages\u002Fevlog\u002Fsrc\u002Fshared\u002Fplugin.ts",[694],[579,1351,1352],{},"packages\u002Fevlog\u002Fsrc\u002Fshared\u002Fplugin.ts",[696,1354,1356],{"id":1355},"a-multi-hook-example","A multi-hook example",[576,1358,1359,1360,1363,1364,633,1367,1369,1370,782],{},"Plugins shine when several concerns share state. Here, a single ",[579,1361,1362],{},"request-metrics"," plugin tracks per-request timing through ",[579,1365,1366],{},"setup",[579,1368,632],{},", and ",[579,1371,639],{},[701,1373,1375],{"className":703,"code":1374,"language":705,"meta":706,"style":706},"import { definePlugin } from 'evlog\u002Ftoolkit'\n\nexport const requestMetricsPlugin = definePlugin({\n  name: 'request-metrics',\n\n  setup({ env }) {\n    statsd.init({ service: env.service })\n  },\n\n  enrich({ event }) {\n    if (event.durationMs !== undefined) event.tier = event.durationMs > 1000 ? 'slow' : 'fast'\n  },\n\n  drain({ event }) {\n    if (event.durationMs !== undefined) {\n      statsd.timing('http.request', event.durationMs, { path: event.path as string })\n    }\n  },\n\n  onRequestStart({ logger, request }) {\n    logger.set({ trace: { startedAt: Date.now() } })\n  },\n\n  onRequestFinish({ event, durationMs }) {\n    if (event && (event.level === 'error' || durationMs > 5000)) {\n      \u002F\u002F alert \u002F forward \u002F etc.\n    }\n  },\n})\n",[579,1376,1377,1396,1400,1417,1431,1435,1449,1478,1482,1486,1498,1562,1566,1571,1585,1606,1661,1667,1672,1677,1695,1738,1743,1748,1767,1813,1819,1824,1829],{"__ignoreMap":706},[710,1378,1379,1381,1383,1385,1387,1389,1391,1394],{"class":712,"line":713},[710,1380,717],{"class":716},[710,1382,721],{"class":720},[710,1384,725],{"class":724},[710,1386,728],{"class":720},[710,1388,731],{"class":716},[710,1390,734],{"class":720},[710,1392,1393],{"class":737},"evlog\u002Ftoolkit",[710,1395,740],{"class":720},[710,1397,1398],{"class":712,"line":743},[710,1399,747],{"emptyLinePlaceholder":746},[710,1401,1402,1404,1406,1409,1411,1413,1415],{"class":712,"line":750},[710,1403,753],{"class":716},[710,1405,757],{"class":756},[710,1407,1408],{"class":724}," requestMetricsPlugin ",[710,1410,763],{"class":720},[710,1412,725],{"class":766},[710,1414,769],{"class":724},[710,1416,772],{"class":720},[710,1418,1419,1421,1423,1425,1427,1429],{"class":712,"line":775},[710,1420,779],{"class":778},[710,1422,782],{"class":720},[710,1424,734],{"class":720},[710,1426,1362],{"class":737},[710,1428,790],{"class":720},[710,1430,793],{"class":720},[710,1432,1433],{"class":712,"line":796},[710,1434,747],{"emptyLinePlaceholder":746},[710,1436,1437,1440,1442,1445,1447],{"class":712,"line":821},[710,1438,1439],{"class":778},"  setup",[710,1441,802],{"class":720},[710,1443,1444],{"class":805}," env",[710,1446,815],{"class":720},[710,1448,818],{"class":720},[710,1450,1451,1454,1456,1458,1460,1462,1465,1467,1469,1471,1474,1476],{"class":712,"line":851},[710,1452,1453],{"class":724},"    statsd",[710,1455,869],{"class":720},[710,1457,89],{"class":766},[710,1459,769],{"class":778},[710,1461,877],{"class":720},[710,1463,1464],{"class":778}," service",[710,1466,782],{"class":720},[710,1468,1444],{"class":724},[710,1470,869],{"class":720},[710,1472,1473],{"class":724},"service",[710,1475,728],{"class":720},[710,1477,898],{"class":778},[710,1479,1480],{"class":712,"line":901},[710,1481,904],{"class":720},[710,1483,1484],{"class":712,"line":907},[710,1485,747],{"emptyLinePlaceholder":746},[710,1487,1488,1490,1492,1494,1496],{"class":712,"line":922},[710,1489,910],{"class":778},[710,1491,802],{"class":720},[710,1493,915],{"class":805},[710,1495,815],{"class":720},[710,1497,818],{"class":720},[710,1499,1500,1502,1504,1507,1509,1512,1515,1518,1520,1522,1524,1527,1529,1531,1533,1535,1538,1542,1545,1547,1550,1552,1555,1557,1560],{"class":712,"line":948},[710,1501,854],{"class":716},[710,1503,857],{"class":778},[710,1505,1506],{"class":724},"event",[710,1508,869],{"class":720},[710,1510,1511],{"class":724},"durationMs",[710,1513,1514],{"class":720}," !==",[710,1516,1517],{"class":720}," undefined",[710,1519,863],{"class":778},[710,1521,1506],{"class":724},[710,1523,869],{"class":720},[710,1525,1526],{"class":724},"tier",[710,1528,830],{"class":720},[710,1530,915],{"class":724},[710,1532,869],{"class":720},[710,1534,1511],{"class":724},[710,1536,1537],{"class":720}," >",[710,1539,1541],{"class":1540},"sbssI"," 1000",[710,1543,1544],{"class":720}," ?",[710,1546,734],{"class":720},[710,1548,1549],{"class":737},"slow",[710,1551,790],{"class":720},[710,1553,1554],{"class":720}," :",[710,1556,734],{"class":720},[710,1558,1559],{"class":737},"fast",[710,1561,740],{"class":720},[710,1563,1564],{"class":712,"line":953},[710,1565,904],{"class":720},[710,1567,1569],{"class":712,"line":1568},13,[710,1570,747],{"emptyLinePlaceholder":746},[710,1572,1574,1577,1579,1581,1583],{"class":712,"line":1573},14,[710,1575,1576],{"class":778},"  drain",[710,1578,802],{"class":720},[710,1580,915],{"class":805},[710,1582,815],{"class":720},[710,1584,818],{"class":720},[710,1586,1588,1590,1592,1594,1596,1598,1600,1602,1604],{"class":712,"line":1587},15,[710,1589,854],{"class":716},[710,1591,857],{"class":778},[710,1593,1506],{"class":724},[710,1595,869],{"class":720},[710,1597,1511],{"class":724},[710,1599,1514],{"class":720},[710,1601,1517],{"class":720},[710,1603,863],{"class":778},[710,1605,772],{"class":720},[710,1607,1609,1612,1614,1617,1619,1621,1624,1626,1628,1630,1632,1634,1636,1638,1641,1643,1645,1647,1650,1653,1657,1659],{"class":712,"line":1608},16,[710,1610,1611],{"class":724},"      statsd",[710,1613,869],{"class":720},[710,1615,1616],{"class":766},"timing",[710,1618,769],{"class":778},[710,1620,790],{"class":720},[710,1622,1623],{"class":737},"http.request",[710,1625,790],{"class":720},[710,1627,809],{"class":720},[710,1629,915],{"class":724},[710,1631,869],{"class":720},[710,1633,1511],{"class":724},[710,1635,809],{"class":720},[710,1637,721],{"class":720},[710,1639,1640],{"class":778}," path",[710,1642,782],{"class":720},[710,1644,915],{"class":724},[710,1646,869],{"class":720},[710,1648,1649],{"class":724},"path",[710,1651,1652],{"class":716}," as",[710,1654,1656],{"class":1655},"sBMFI"," string",[710,1658,728],{"class":720},[710,1660,898],{"class":778},[710,1662,1664],{"class":712,"line":1663},17,[710,1665,1666],{"class":720},"    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Date",[710,1725,869],{"class":720},[710,1727,1728],{"class":766},"now",[710,1730,1731],{"class":778},"() ",[710,1733,956],{"class":720},[710,1735,728],{"class":720},[710,1737,898],{"class":778},[710,1739,1741],{"class":712,"line":1740},22,[710,1742,904],{"class":720},[710,1744,1746],{"class":712,"line":1745},23,[710,1747,747],{"emptyLinePlaceholder":746},[710,1749,1751,1754,1756,1758,1760,1763,1765],{"class":712,"line":1750},24,[710,1752,1753],{"class":778},"  onRequestFinish",[710,1755,802],{"class":720},[710,1757,915],{"class":805},[710,1759,809],{"class":720},[710,1761,1762],{"class":805}," durationMs",[710,1764,815],{"class":720},[710,1766,818],{"class":720},[710,1768,1770,1772,1774,1776,1779,1781,1783,1785,1788,1791,1793,1796,1798,1801,1803,1805,1808,1811],{"class":712,"line":1769},25,[710,1771,854],{"class":716},[710,1773,857],{"class":778},[710,1775,1506],{"class":724},[710,1777,1778],{"class":720}," 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",[710,1921,763],{"class":720},[710,1923,1869],{"class":766},[710,1925,769],{"class":724},[710,1927,790],{"class":720},[710,1929,1930],{"class":737},"user-agent",[710,1932,790],{"class":720},[710,1934,809],{"class":720},[710,1936,1937],{"class":766}," createUserAgentEnricher",[710,1939,1912],{"class":724},[576,1941,1942,1943,1946],{},"These are equivalent to a ",[579,1944,1945],{},"definePlugin({ name, drain | enrich })"," shape but read more clearly when intent is obvious.",[696,1948,1950],{"id":1949},"common-pitfalls","Common pitfalls",[617,1952,1953,1962,1973,1996],{},[620,1954,1955,1958,1959,1961],{},[584,1956,1957],{},"Don't throw from a hook."," The plugin runner catches and logs errors with the plugin name, but a thrown error from ",[579,1960,636],{}," won't propagate the event downstream. Keep hooks defensive.",[620,1963,1964,1969,1970,1972],{},[584,1965,1966,1968],{},[579,1967,639],{}," runs for every event",": not just per-request. If you only care about per-request lifecycle, use ",[579,1971,651],{}," instead.",[620,1974,1975,1980,1981,1984,1985,1988,1989,1992,1993,869],{},[584,1976,1977,1979],{},[579,1978,642],{}," mutates the logger object",": augment ",[579,1982,1983],{},"RequestLogger"," in a ",[579,1986,1987],{},".d.ts"," so ",[579,1990,1991],{},"useLogger(event)"," exposes the new methods to TypeScript. See ",[592,1994,1995],{"href":72},"typed fields",[620,1997,1998,2004,2005,2007],{},[584,1999,2000,2001],{},"Plugins are de-duplicated by ",[579,2002,2003],{},"name",". Re-registering with the same ",[579,2006,2003],{}," replaces the previous version (last registration wins).",[696,2009,2011],{"id":2010},"next-steps","Next steps",[617,2013,2014,2020,2026,2032],{},[620,2015,2016,2019],{},[592,2017,2018],{"href":482},"Custom Enrichers",": single-hook enrichment",[620,2021,2022,2025],{},[592,2023,2024],{"href":495},"Custom Drains",": single-destination output",[620,2027,2028,2031],{},[592,2029,2030],{"href":486},"Tail Sampling",": outcome-aware keep decisions",[620,2033,2034,2037],{},[592,2035,2036],{"href":490},"Identity Headers",": tag every drain request",[2039,2040,2041],"style",{},"html pre.shiki code .s7zQu, html code.shiki .s7zQu{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}html pre.shiki code .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .s2Zo4, html code.shiki .s2Zo4{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .sHdIc, html code.shiki .sHdIc{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#EEFFFF;--shiki-default-font-style:italic;--shiki-dark:#BABED8;--shiki-dark-font-style:italic}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .sHwdD, html code.shiki .sHwdD{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#546E7A;--shiki-default-font-style:italic;--shiki-dark:#676E95;--shiki-dark-font-style:italic}html pre.shiki code .sbssI, html code.shiki .sbssI{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}html pre.shiki code .sBMFI, html code.shiki .sBMFI{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}",{"title":706,"searchDepth":743,"depth":743,"links":2043},[2044,2045,2046,2047,2048,2049],{"id":698,"depth":743,"text":699},{"id":1133,"depth":743,"text":1196},{"id":1355,"depth":743,"text":1356},{"id":1838,"depth":743,"text":1839},{"id":1949,"depth":743,"text":1950},{"id":2010,"depth":743,"text":2011},"definePlugin is evlog's canonical extension point: opt into any subset of the lifecycle hooks from one cohesive object.","md",[2053,2056,2057],{"label":2018,"icon":438,"to":482,"color":2054,"variant":2055},"neutral","subtle",{"label":2024,"icon":497,"to":495,"color":2054,"variant":2055},{"label":2030,"icon":64,"to":486,"color":2054,"variant":2055},{},{"title":477,"icon":452},{"title":477,"description":2050},"lHmNDcHdColI0zouUgFyoZnmxUjg2evESk4tAXu581Q",[2063,2065],{"title":410,"path":473,"stem":474,"description":2064,"icon":475,"children":-1},"Concrete copy-paste recipes — build your own minimal devtool, pipe to curl + jq, replay history then go live, and aggregate on the consumer side.",{"title":481,"path":482,"stem":483,"description":2066,"icon":438,"children":-1},"Write an enricher that adds deployment metadata, tenant ids, feature flags, or anything computed. Error isolation and merging are handled.",1788966794812]